Converted remoting.Error from an enum to a class

remoting/webapp/crd/js/host_install_dialog.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
@@ skipping 12 matching lines @@
   this.onOkClickedHandler_ = this.onOkClicked_.bind(this);
   this.onCancelClickedHandler_ = this.onCancelClicked_.bind(this);
   this.onRetryClickedHandler_ = this.onRetryClicked_.bind(this);
 
   this.continueInstallButton_.disabled = false;
   this.cancelInstallButton_.disabled = false;
 
   /** @private*/
   this.onDoneHandler_ = function() {};
 
-  /** @param {remoting.Error} error @private */
+  /** @param {!remoting.Error} error @private */
   this.onErrorHandler_ = function(error) {};
 
   /**
    * @type {remoting.HostInstaller}
    * @private
    */
   this.hostInstaller_ = new remoting.HostInstaller();
 };
 
 /**
  * Starts downloading host components and shows installation prompt.
  *
  * @param {function():void} onDone Callback called when user clicks Ok,
  * presumably after installing the host. The handler must verify that the host
  * has been installed and call tryAgain() otherwise.
- * @param {function(remoting.Error):void} onError Callback called when user
+ * @param {function(!remoting.Error):void} onError Callback called when user
  *    clicks Cancel button or there is some other unexpected error.
  * @return {void}
  */
 remoting.HostInstallDialog.prototype.show = function(onDone, onError) {
   this.continueInstallButton_.addEventListener(
       'click', this.onOkClickedHandler_, false);
   this.cancelInstallButton_.addEventListener(
       'click', this.onCancelClickedHandler_, false);
   remoting.setMode(remoting.AppMode.HOST_INSTALL_PROMPT);
 
   /** @type {function():void} */
   this.onDoneHandler_ = onDone;
 
-  /** @type {function(remoting.Error):void} */
+  /** @type {function(!remoting.Error):void} */
   this.onErrorHandler_ = onError;
 
   /** @type {remoting.HostInstaller} */
   var hostInstaller = new remoting.HostInstaller();
 
   /** @type {remoting.HostInstallDialog} */
   var that = this;
 
   this.hostInstaller_.downloadAndWaitForInstall().then(function() {
     that.continueInstallButton_.click();
@@ skipping 39 matching lines @@
 
 remoting.HostInstallDialog.prototype.onRetryClicked_ = function() {
   this.retryInstallButton_.removeEventListener(
       'click', this.onRetryClickedHandler_.bind(this), false);
   this.continueInstallButton_.addEventListener(
       'click', this.onOkClickedHandler_, false);
   this.cancelInstallButton_.addEventListener(
       'click', this.onCancelClickedHandler_, false);
   remoting.setMode(remoting.AppMode.HOST_INSTALL_PROMPT);
 };